New answers tagged table
That table is essentially the same as for all of the other "meta" tables in the WordPress architecture. It holds misc. bits of extra, usually optional, information about the associated post, user, or in this case comment. You can store whatever information you need to add to a comment-- perhaps a plugin wants to implement "abuse" flags, or comment upvotes. ...
This can be used, mainly by plugins, to add some additional information to a comment. By having one generic table you don't need to add columns to wp_comment for every additional piece of data. E.g. a plugin could add a rating to each comment and store that value in wp_commentmeta.
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